39397779 has 8 divisors (see below), whose sum is σ = 58367120. Its totient is φ = 26265168.

The previous prime is 39397769. The next prime is 39397801. The reversal of 39397779 is 97779393.

It is not a de Polignac number, because 39397779 - 2⁴ = 39397763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39397739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729562 + ... + 729615.

It is an arithmetic number, because the mean of its divisors is an integer number (7295890).

Almost surely, 2^39397779 is an apocalyptic number.

39397779 is a deficient number, since it is larger than the sum of its proper divisors (18969341).

39397779 is a wasteful number, since it uses less digits than its factorization.

39397779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459186 (or 1459180 counting only the distinct ones).

The product of its digits is 2250423, while the sum is 54.

The square root of 39397779 is about 6276.7650107360. The cubic root of 39397779 is about 340.2701975589.

The spelling of 39397779 in words is "thirty-nine million, three hundred ninety-seven thousand, seven hundred seventy-nine".